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621688e4 | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2048, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | // Author: Dariusz Miskowiec <mailto:d.miskowiec@gsi.de> 2005 | |
17 | ||
18 | //============================================================================= | |
19 | // two-particle correlation analyzer | |
20 | // Loop over pairs and fill pair histograms. The first particle is always | |
21 | // taken from ev0 and the second from ev1 so for ev0=ev1 one is getting true | |
22 | // pairs, otherwise mixed ones. | |
23 | //============================================================================= | |
24 | ||
25 | #include <TROOT.h> | |
26 | #include <TMath.h> | |
27 | #include <TRandom2.h> | |
28 | #include "AliUnicorEvent.h" | |
29 | #include "AliUnicorHN.h" | |
30 | #include "AliUnicorAnalCorrel.h" | |
31 | ||
32 | ClassImp(AliUnicorAnalCorrel) | |
33 | ||
34 | //============================================================================= | |
35 | AliUnicorAnalCorrel::AliUnicorAnalCorrel(Char_t *nam, Double_t emi, Double_t ema, | |
36 | Int_t pid0, Int_t pid1): | |
37 | AliUnicorAnal(nam), fPid0(pid0), fPid1(pid1), fMass0(0), fMass1(0), fPa() | |
38 | { | |
39 | // constructor | |
40 | // emi and ema define the rapidity range for histogram | |
41 | ||
42 | TParticlePDG *part0 = AliUnicorAnal::fgPDG.GetParticle(fPid0); | |
43 | TParticlePDG *part1 = AliUnicorAnal::fgPDG.GetParticle(fPid1); | |
44 | fMass0 = part0? part0->Mass() : 0; | |
45 | fMass1 = part1? part1->Mass() : 0; | |
621688e4 | 46 | double pi = TMath::Pi(); |
c6fc7f72 | 47 | |
48 | // correlation function | |
49 | ||
76d78859 | 50 | //int npt = 7; double ptbins[]={0,0.1,0.2,0.3,0.4,0.5,0.7,1.0}; |
51 | //int npt = 6; double ptbins[]={0,0.1,0.25,0.35,0.55,1.0,2.0}; // like Adam, except last bin split | |
52 | int npt = 7; double ptbins[]={0,0.1,0.25,0.40,0.55,0.7,1.0,2.0}; // like Adam in Mar-2010, + first+last | |
53 | ||
c6fc7f72 | 54 | double qbins[100]; |
55 | for (int i=0;i<20;i++) qbins[i]=i*0.005; | |
56 | for (int i=0;i<45;i++) qbins[20+i]=0.1+i*0.02; | |
57 | ||
621688e4 | 58 | TAxis *ax[8]; |
59 | ax[0] = new TAxis(3,-0.5,2.5);ax[0]->SetTitle("trumixrot"); | |
040da09c | 60 | ax[1] = new TAxis(5,0,1.0); ax[1]->SetTitle("centrality"); |
76d78859 | 61 | ax[2] = new TAxis(3,emi,ema); ax[2]->SetTitle("y"); // pair y |
62 | // ax[3] = new TAxis(8,-pi,pi); ax[3]->SetTitle("phi"); // wrt event plane | |
63 | ax[3] = new TAxis(1,-pi,pi); ax[3]->SetTitle("phi"); // wrt event plane | |
64 | ax[4] = new TAxis(npt,ptbins);ax[4]->SetTitle("kt (GeV/c)"); // pair pt/2 | |
621688e4 | 65 | ax[5] = new TAxis(8,0,pi); ax[5]->SetTitle("q-theta"); |
66 | ax[6] = new TAxis(16,-pi,pi); ax[6]->SetTitle("q-phi"); | |
040da09c | 67 | //ax[7] = new TAxis(64,qbins); ax[7]->SetTitle("q (GeV/c)"); |
76d78859 | 68 | ax[7] = new TAxis(150,0,3.0); ax[7]->SetTitle("q (GeV/c)"); |
621688e4 | 69 | AliUnicorHN *pair = new AliUnicorHN("pair",8,ax); |
70 | for (int i=0; i<8; i++) delete ax[i]; | |
71 | fHistos.Add(pair); | |
c6fc7f72 | 72 | |
76d78859 | 73 | // correlation function bin monitor (needed to get <kt> etc.) |
74 | ||
75 | ax[0] = new TAxis(5,0,1); ax[0]->SetTitle("centrality"); | |
76 | ax[1] = new TAxis(30,emi,ema); ax[1]->SetTitle("y"); // pair y | |
77 | ax[2] = new TAxis(100,0,2); ax[2]->SetTitle("kt (GeV/c)"); // pair pt/2 | |
78 | AliUnicorHN *bimo = new AliUnicorHN("bimo",3,ax); | |
79 | for (int i=0; i<3; i++) delete ax[i]; | |
80 | fHistos.Add(bimo); | |
81 | ||
c6fc7f72 | 82 | // two-track resolution monitoring histogram |
83 | ||
84 | ax[0] = new TAxis(3,-0.5,2.5); ax[0]->SetTitle("trumixrot"); | |
85 | ax[1] = new TAxis(2,-0.5,1.5); ax[1]->SetTitle("cut applied"); | |
76d78859 | 86 | ax[2] = new TAxis(npt,ptbins); ax[2]->SetTitle("(pair pt)/2 (GeV)"); |
c6fc7f72 | 87 | ax[3] = new TAxis(80,-0.02,0.02); ax[3]->SetTitle("dtheta"); |
88 | ax[4] = new TAxis(80,-0.04,0.04); ax[4]->SetTitle("dphi"); | |
89 | AliUnicorHN *twot = new AliUnicorHN("twot",5,ax); | |
90 | for (int i=0; i<5; i++) delete ax[i]; | |
91 | fHistos.Add(twot); | |
92 | ||
621688e4 | 93 | gROOT->cd(); |
94 | printf("%s object named %s created\n",ClassName(),GetName()); | |
95 | } | |
96 | //============================================================================= | |
c6fc7f72 | 97 | void AliUnicorAnalCorrel::Process(Int_t tmr, const AliUnicorEvent * const ev0, const AliUnicorEvent * const ev1, Double_t phirot) |
621688e4 | 98 | { |
99 | // process pairs from one or two (if mixing) events | |
100 | // tmr tells which histogram (bins) to fill: tru,mix,rot | |
101 | ||
102 | // Could be possibly accelerated by checking the "good particle" only once | |
103 | // and caching the result. (Maybe the optimizer does it already.) | |
104 | ||
105 | static TRandom2 ran; | |
106 | AliUnicorHN *pair = (AliUnicorHN*) fHistos.At(0); | |
76d78859 | 107 | AliUnicorHN *bimo = (AliUnicorHN*) fHistos.At(1); |
108 | AliUnicorHN *twot = (AliUnicorHN*) fHistos.At(2); | |
621688e4 | 109 | |
110 | // mixing-and-rotating-proof centrality and reaction plane angle | |
111 | // (but not rotation-proof for rotation angles much different from 0 and 180) | |
112 | // true and rotated pairs are within the triangle (j<i), mixed - all | |
113 | // thus, proper rotation is either by 180, or by 170 AND 190, etc. | |
114 | ||
115 | double cent = (ev0->Centrality()+ev1->Centrality())/2.0; | |
116 | double q0x,q0y,q1x,q1y; | |
117 | ev0->RP(q0x,q0y); | |
118 | ev1->RP(q1x,q1y); | |
119 | double rpphi = atan2(q0y+q1y,q0x+q1x); | |
120 | ||
121 | // loop over pairs | |
122 | ||
123 | for (int i=0; i<ev0->NParticles(); i++) { | |
124 | if (!ev0->ParticleGood(i,fPid0)) continue; | |
125 | for (int j=0; j<ev1->NParticles(); j++) { | |
126 | if (ev0==ev1 && j<i && fPid0==fPid1 ) continue; | |
127 | if (ev0==ev1 && j==i) continue; // beware, not even when rotated or non-identical | |
128 | if (!ev1->ParticleGood(j,fPid1)) continue; | |
621688e4 | 129 | fPa.Set0(fMass0,ev0->ParticleP(i),ev0->ParticleTheta(i),ev0->ParticlePhi(i)); |
130 | fPa.Set1(fMass1,ev1->ParticleP(j),ev1->ParticleTheta(j),ev1->ParticlePhi(j)+phirot); | |
131 | if (ev0==ev1 && fPid0==fPid1 && ran.Rndm()>=0.5) fPa.Swap(); | |
c6fc7f72 | 132 | twot->Fill((double) tmr, 0.0, fPa.Pt()/2.0, fPa.DTheta(), fPa.DPhi(),1.0); |
133 | if (!ev0->PairGood(ev0->ParticleP(i),ev0->ParticleTheta(i),ev0->ParticlePhi(i), | |
134 | ev1->ParticleP(j),ev1->ParticleTheta(j),ev1->ParticlePhi(j)+phirot)) continue; | |
135 | twot->Fill((double) tmr, 1.0, fPa.Pt()/2.0, fPa.DTheta(), fPa.DPhi(),1.0); | |
621688e4 | 136 | fPa.CalcLAB(); |
137 | fPa.CalcPairCM(); | |
76d78859 | 138 | //fPa.CalcLcmsCM(); |
621688e4 | 139 | if (fPa.QCM()==0) return; // should not be too frequent |
140 | double phi = TVector2::Phi_mpi_pi(fPa.Phi()-rpphi); | |
040da09c | 141 | double weigth = 1.0; |
76d78859 | 142 | // if (tmr==0) weigth = 1.0+0.5*exp(-fPa.QCM()*fPa.QCM()*1*1/0.197/0.197); |
c6fc7f72 | 143 | pair->Fill((double) tmr, // 0 for tru, 1 for mix, 2 for rot |
621688e4 | 144 | cent, // centrality |
145 | fPa.Rapidity(), // pair rapidity | |
146 | phi, // pair phi wrt reaction plane | |
147 | fPa.Pt()/2.0, // half of pair pt | |
148 | fPa.QCMTheta(), // polar angle of Q | |
149 | fPa.QCMPhiOut(), // azimuthal angle of Q w.r.t. out | |
150 | fPa.QCM(), // |p2-p1| in c.m.s. | |
040da09c | 151 | weigth); // weigth |
76d78859 | 152 | if (tmr) continue; |
153 | if (fPa.QCM()>0.2) continue; | |
154 | bimo->Fill(cent, fPa.Rapidity(), fPa.Pt()/2.0, 1.0); | |
621688e4 | 155 | } |
156 | } | |
157 | } | |
158 | //============================================================================= |